Search

EP-4303487-B1 - SOLID FUEL COMBUSTION DEVICE

EP4303487B1EP 4303487 B1EP4303487 B1EP 4303487B1EP-4303487-B1

Inventors

  • OKIYONEDA Hiroaki
  • TANIMURA YUJI
  • YAMAMOTO KOJI

Dates

Publication Date
20260506
Application Date
20210301

Claims (5)

  1. A solid fuel combustion apparatus (1) in which a plurality of solid fuels are fed to a combustion unit (10) to obtain combustion heat through combustion, wherein the combustion unit (10) includes: a first combustion chamber (11) that burns the solid fuels; a feeder (12) that feeds the solid fuels to the first combustion chamber (11); a turntable (20) that forms a lower surface portion (17) of the first combustion chamber (11) and turns the solid fuels fed from the feeder (12) on the lower surface portion (17) of the chamber (11); and an agitator (30) that agitates the fuels accumulated on the turntable (20), characterized in that a second combustion chamber (52) is provided above the first combustion chamber (11) for flame generated by combustion of the solid fuels to rise, wherein an air feeder (F) that feeds air for combustion of the solid fuels is provided in the second combustion chamber (52), wherein the solid fuel combustion apparatus further includes a combustion smoke imaging unit (110) that images combustion smoke generated at a time of combustion of the solid fuels and a fuel quantity controller (M1) that controls quantity of the solid fuels fed from the feeder (12) to the first combustion chamber (11), wherein the fuel quantity controller (M1) controls the quantity of solid fuels fed from the feeder (12) to the first combustion chamber (11) by determining quantity of the burned solid fuels on the basis of a color of the combustion smoke imaged by the combustion smoke imaging unit (110) and an air volume controller (F) that controls a volume of air fed from the air feeder (F) to the second combustion chamber (52), wherein the air volume controller (F) controls the volume of air fed from the air feeder (F) to the second combustion chamber (52) by determining quantity of the burned solid fuels on the basis of a color of the combustion smoke imaged by the combustion smoke imaging unit (110).
  2. The solid fuel combustion apparatus (1) according to claim 1, wherein the first combustion chamber (11) is cylindrical in shape and the feeder (12) feeds the solid fuels to a circumferential edge (21) of the turntable (20).
  3. The solid fuel combustion apparatus (1) according to claim 1, wherein a hole (22) is formed in the turntable (20), into which hole (22) combustion ash (As) of the solid fuels falls, and a combustion ash discharger (42) is provided below the turntable (20).
  4. The solid fuel combustion apparatus (1) according to claim 3, wherein a dust collector (40) is provided in a lower portion of the turntable (20), and the dust collector (40) stirs up the combustion ash (As) that falls from the turntable (20).
  5. The solid fuel combustion apparatus (1) according to claim 1, wherein the agitator (30) includes an agitating impeller (32) or an elongate plate object to move the solid fuels accumulated on the turntable (20) to a vicinity of the center of the turntable (20).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a solid fuel combustion apparatus. More specifically, the present invention relates to a solid fuel combustion apparatus that burns combustible solid wastes as fuels to obtain heat. 2. Description of Related Art Solid combustible wastes such as resins (plastics) have been used as raw materials for refuse derived paper and plastics densified fuel (RPF). Even wastes can be easily burned in the calciner to obtain the same level of heat as that of the existing coke and other materials. In addition, since the wastes are treated as solid fuels, the entire volume of emissions of carbon dioxide is expected to be reduced in comparison to a case where fuels such as heavy oil or natural gas are newly burned. When solid fuels such as RPF are burned in a calciner, they have poor flowability in the apparatus (calciner), and calcined ashes are also produced after the solid fuels are calcined. This reduces the combustion efficiency of the solid fuels in the calciner (firing furnace) if the solid fuels are simply fed into the calciner. In addition, the calciner cannot be safely operated without adequate removal of calcined ashes. Accordingly, a calciner incorporating improvements related to the feed of solid fuels and removal of calcined ashes has been proposed (e.g., patent documents 1 and 2). However, according to the calciner described in patent documents 1 and 2, the feed of solid fuels to the inside of the calciner and the removal of calcined ashes after firing of the solid fuels have been not always sufficient, and further improvement has been desired. In addition, as the mechanism of the calciner is complicated, the mechanism for feeding the solid fuels, for example, is exposed to heat during the calcining of the solid fuels in the calciner, thereby easily reducing the durability of the apparatus. Therefore, less progress has been made in improving the apparatus in the current calciner. [Prior Art Documents] [Patent Documents] [Patent Document 1] Japanese Laid-Open Patent Publication No. 2014-211255[Patent Document 2] Japanese Laid-Open Patent Publication No. 2008-261527[Patent Document 3] KR 100 530 186 B1 covers the features specified in the preamble of claim 1. SUMMARY OF THE INVENTION The applicant has completed a novel solid fuel combustion apparatus by obtaining an effective configuration for feeding solid fuels avoiding heat exposure during calcination, ensuring the movement of solid fuels inside the calciner, and removing calcined ashes after diligent study. An object of the present invention is to provide a solid fuel combustion apparatus that uses combustible solid wastes such as resin (plastic) as solid fuels, avoids damage to portions related to the feed of the solid fuels due to heat exposure during calcining, and ensures excellent movement of the solid fuels inside the combustion apparatus. [Means to Solve the Problems] A solid fuel combustion apparatus according to an embodiment in which a plurality of solid fuels are fed to a combustion unit to obtain combustion heat through combustion is provided. The combustion unit includes a first combustion chamber that burns solid fuels; a feeder that feeds the solid fuels to the first combustion chamber; a turntable that forms a lower surface portion of the first combustion chamber and turns the solid fuels fed from the feeder on the lower surface portion of the turntable, and an agitator that agitates the solid fuels accumulated on the turntable. Further, the first combustion chamber may be cylindrical in shape and the feeder may feed the solid fuels to the circumferential edge of the turntable. Moreover, a hole may be formed in the turntable, into which hole combustion ash of the solid fuels falls, and a combustion ash discharger may be provided below the turntable. Furthermore, a dust collector may be provided in a lower portion of the turntable, and the dust collector may be used to stir up the combustion ash that falls from the turntable. According to the invention, a second combustion chamber is provided above the first combustion chamber for the flame generated by the combustion of the solid fuels to rise. Further, according to the invention, an air feeder that feeds air for combustion of the solid fuels is provided in the second combustion chamber. Moreover, the agitator may include an agitating impeller or an elongate plate object to move the solid fuels accumulated on the turntable to a vicinity of the center of the turntable. Furthermore, according to the invention, the solid fuel combustion apparatus further includes: a combustion smoke imaging unit that images combustion smoke generated at a time of combustion of the solid fuels; and a fuel quantity controller that controls quantity of the solid fuels fed from the feeder to the first combustion chamber. The fuel quantity controller controls the quantity of solid fuels fed from the feeder to the first combustion chamber